Pull request #263232: BI-143696 fix: 对象.**容错

Merge in DEC/fineui from ~JIMMY.CHAI/dec-fineui:final/11.0 to final/11.0

* commit '2d1e16fb36dfa862eea558c28fa4953704051ecb':
  BI-143696 fix: 对象.**容错

packages/fineui/src/fix/fix.js

@@ -929,7 +929,7 @@ function watch(model, expOrFn, cb, options) {
                     return m;
                 } : parsePath(exp);
                 const v = getter.call(model, model);
-                if (v.__ob__) {
+                if (v && v.__ob__) {
                     const dep = new Dep();
                     if (isGlobal) {
                         (v.__ob__._scopeDeps || (v.__ob__._scopeDeps = [])).push(dep);